This research presents the fabrication and characterization of an interdigitated capacitive
(IDC) sensor on a wooden substrate using pencil traces. The resistance of the pencil traces
decreased from 100 kΩ to 5 kΩ as the pencil grade shifted from HB to 8B. Concurrently,
capacitance measurements revealed an increase from approximately 5 pF for a 5-finger IDC
made with HB pencil to around 32 pF for an 8B pencil counterpart. Increasing the number of
pencil traces from 10 to 50 resulted in a significant decrease in resistance and a proportional …